If Floyd Mayweather and Conor McGregor are going to meet in a boxing ring, it won't be on Sept. 16. That date -- which, according to UFC president Dana White, was the targeted night for the megafight -- now belongs to Canelo Alvarez and Gennady Golovkin.

"We just lost our date to Canelo and GGG," White told Fight Hub TV late Saturday night in Las Vegas. "But that's a good fight. I'll be at that one, too."

Las Vegas sportsbooks already are taking thousands of dollars in bets on a Floyd Mayweather-Conor McGregor fight even though the blockbuster bout has not been finalized.

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The comments came moments after Alvarez dominated Julio Cesar Chavez Jr. for 12 rounds, winning by unanimous decision. Immediately after the bout, former boxing legend Oscar De La Hoya announced that his Golden Boy Promotions had the contracts signed between Alvarez and Golovkin, with the fight set for mid-September.

When, and if, Mayweather and McGregor face each other in a boxing match is another story, though it has long been rumored that the fall of 2017 is the preferred time frame for both camps. One roadblock was cleared this week when McGregor's girlfriend, Dee Devlin, gave birth to their first child, Conor Jr.

McGregor has stated he would wait for the birth of his child before he'd begin serious discussions and train for a fight.

The potential boxing match would pit the highest-profile stars in their respective sports against one other in an event unlike almost anything seen before. Mayweather, 40, is 49-0 and a five-division world champion boxer. McGregor, 28, is 21-3 and the reigning UFC lightweight champion.